EP2301358A2 - Installation de récupération de chaleur d'un four de cuisson - Google Patents

Installation de récupération de chaleur d'un four de cuisson Download PDF

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Publication number
EP2301358A2
EP2301358A2 EP10009071A EP10009071A EP2301358A2 EP 2301358 A2 EP2301358 A2 EP 2301358A2 EP 10009071 A EP10009071 A EP 10009071A EP 10009071 A EP10009071 A EP 10009071A EP 2301358 A2 EP2301358 A2 EP 2301358A2
Authority
EP
European Patent Office
Prior art keywords
exhaust air
heat exchanger
collecting box
oven
plant according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10009071A
Other languages
German (de)
English (en)
Other versions
EP2301358A3 (fr
Inventor
Stefan Heine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ganzenmueller Ulrike
Original Assignee
Ganzenmueller Ulrike
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ganzenmueller Ulrike filed Critical Ganzenmueller Ulrike
Publication of EP2301358A2 publication Critical patent/EP2301358A2/fr
Publication of EP2301358A3 publication Critical patent/EP2301358A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
    • A21B3/00—Parts or accessories of ovens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/08—Fluid driving means, e.g. pumps, fans
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking

Definitions

  • the invention relates to an oven-waste air heat recovery system for ovens.
  • the heat exchangers are connected to the airway by flap systems.
  • flap systems In the case of a malfunction of the flap systems or a contamination-related or condensation-related blockage of the heat exchanger blockage of the air path through the heat exchanger can lead to a dangerous overheating of the furnace or the furnace in the air downstream air ducts.
  • the object of the invention is to provide an improved heat recovery system for ovens available, in which one or more of the disadvantages mentioned are overcome.
  • the invention is characterized according to a first aspect, characterized in that an oven-exhaust air heat recovery system for ovens, the exhaust air from flue gas and steam from at least one oven, also different design, the collecting air mixing mixing box or tube is supplied in which a heat exchanger is provided in the course of the exhaust air downstream of the collecting box or pipe, wherein the heat exchanger is configured by a pipe system carrying the exhaust air, which is externally circulated with a fluid absorbing the heat of the exhaust air, wherein an outlet Collection box or pipe is provided in the exhaust path after the heat exchanger, from which the cooled exhaust air is supplied to a chimney, is configured such that parallel to the heat exchanger between the collecting box and outlet collection box, a bypass is provided, which is able to pass through the exhaust air flow, wherein a closure flap system is provided, wel Ches the heat exchanger and / or the bypass for the exhaust air opens or locks, a system monitoring the control unit (safety unit) is provided, which adjusts the shutter in the event of malfunction of
  • the bypass flap prevents unwanted and dangerous overheating due to automatic opening of the bypass by means of the flaps if the heat exchanger clogs or otherwise malfunctions. So the baking operation remains ensured and it can lead to no carbon monoxide poisoning come.
  • By the invention can be easily baked even in case of disturbances.
  • Conscious mixing of flue gas and steam reduces deposits on the insides of the heat exchanger to a minimum.
  • the system does not set itself in the shortest possible time. It is sufficient a simple Ausfegen the outlet header, since the dried-together particles are blown there by the air flow and fall down without adding the tubes of the heat exchanger as conventional by addition and encrustation. The maximum efficiency is thus maintained by always clean surfaces, the investment costs are lower, in addition, the system is low maintenance. An improved environmental compatibility is also given.
  • the embodiment is characterized in that at the exhaust air outlet end of the chimney in Ab povertyweg an induced draft fan is provided, which pulls the exhaust air to the outside, wherein the induced draft fan by means of a control unit and a thereto evaluated pressure sensor, the is arranged in the collecting box or the outlet collecting box, is controlled so that in the collecting box or the outlet collection box with a constant negative pressure, the exhaust air is sucked.
  • the downstream induced draft fan holds the advantage of the negative pressure by means of PLC control and pressure measurement constant (Constant control), wherein the Pa value can be adjusted in one embodiment by means of the controller, if necessary.
  • the embodiment is characterized in that the heat exchanger is formed by a bundle of parallel arranged, the exhaust air passing pipes, which in turn are arranged in a hollow body which encloses the outer sides and with a fluid for cooling the outer sides of the Piping is flowed through.
  • the following may be formed by a tube according to an advantageous embodiment of the hollow body.
  • the proposed arrangements according to the invention have the advantage that the flue gas and the swaths of the individual ovens need not be treated separately, but that they are mixed in the collecting box and fed together to the heat exchanger.
  • oil and gas can be used for heating as well as solid fuels.
  • the entrained material can easily drain through drains, or dries and drops from the smooth walls of the pipes and can be swept.
  • the exhaust gas temperature is lowered environmentally friendly by about 150 ° C. There are no weather-related Switzerlandschwankache more.
  • An advantageous development of the invention according to one of the three aspects is characterized in that immediately after an oven, a pressure sensor in the exhaust path in front of a Valve is provided, wherein the pressure sensor controls the motor-controlled delivery of the valve so that the acting in the oven suction of the header box is pre-selectably adjustable.
  • control unit is designed and adjusted so that a negative pressure is generated in each oven.
  • a negative pressure is generated in each oven.
  • the heat exchanger removes heat from the exhaust air up to its condensation limit, for which purpose sensors are provided which measure the condensation point of the exhaust air, and a fluid control evaluating the sensors controls the fluid flow flow and thus the degree of cooling.
  • this control also takes place via the control unit.
  • the walls of the pipes of the heat exchanger are advantageously designed by smooth tubes made of stainless steel.
  • control unit controls the butterfly valves and / or the flap system so that when you turn off the ovens their exhaust is closed to reduce their cooling. This is also called comfort control.
  • the comfort control of the flaps reduces the cooling of the ovens so that the heat-up times of the ovens are greatly reduced while saving energy.
  • the systems of the invention no longer require a footprint of 3 - 5 square meters as in the previous known designs because they can be mounted to save space on the ovens.
  • the aim of the system is to dissipate the flue gases and swaths that are present at the oven in order to extract the remaining heat energy and make it available for heating purposes.
  • Fig. 1 is a schematic sectional view through an inventive oven-exhaust air heat recovery system 1 for the exhaust air from flue gas and steam from at least one oven shown.
  • the exhaust air is supplied through a collecting pipe 31 to a collecting box 3 which mixes the exhaust air.
  • a heat exchanger 4 and a bypass 8 connects, which each pass through a controllable flap system 91 and 92, the exhaust air more or less.
  • the heat exchanger 4 is formed by a pipe system leading the exhaust air 41, which is externally flowed around with a heat of the exhaust air receiving fluid 5.
  • Fig. 2 is the heat exchanger 4 off Fig. 1 shown in a sectional view in the direction II.
  • the heat exchanger 4 is formed by a bundle of parallel arranged, the exhaust air-conducting pipes 41, which in turn in a hollow body 42 are arranged, which encloses its outer sides and is flowed through by a fluid 5 for cooling the outer sides of the pipes 41.
  • the hollow body 42 and the bypass 8 are formed by a tube.
  • the walls of the pipelines 41 of the heat exchanger 4 are configured in the example by smooth tubes made of stainless steel. As a result, dirt and other substances can hardly adhere. Of advantage are all coming into contact with the flue gases and steam metal parts made of stainless steel.
  • Fig. 3 is also the system monitoring the control unit 10 (safety unit) shown, which in the case of malfunction of one of the components, the shutters 91, 92 sets or controls that the bypass 8 is fully opened.
  • control unit 10 safety unit
  • a suction fan 11 is provided in the exhaust path, which draws the exhaust air to the outside, wherein the induced draft fan 11 by means of the control unit 10 and a thereto evaluated pressure sensor 12, which is arranged in front of the collecting box 3, is controlled so that in the collecting tank 3 with a constant negative pressure, the exhaust air of the ovens 2 is sucked.
  • a pressure sensor is provided in the exhaust path, wherein the pressure sensor via the control unit 10, the motor-controlled delivery of the control valves 21 controls so that acting in each oven 2 induced draft of the collecting tank 3 is preselected adjustable.
  • a negative pressure is generated in each oven 2.
  • a uniform negative pressure is generated whereby known natural fluctuations in the pressure in the chimney are compensated (reduced pressure and overpressure).
  • the control unit 10 is set in the example so that the valves 21 and / or the flap system 91, 92 is controlled so that when switching off the ovens 2 whose exhaust air is closed to reduce their cooling.
  • the system is designed so that it can be mounted over the ovens and thus no space or footprint in the bakery is needed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Chimneys And Flues (AREA)
EP10009071.1A 2009-09-02 2010-09-01 Installation de récupération de chaleur d'un four de cuisson Withdrawn EP2301358A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009039689A DE102009039689A1 (de) 2009-09-02 2009-09-02 Backofen-Abluft-Wärmerückgewinnungsanlage

Publications (2)

Publication Number Publication Date
EP2301358A2 true EP2301358A2 (fr) 2011-03-30
EP2301358A3 EP2301358A3 (fr) 2013-12-18

Family

ID=43525203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10009071.1A Withdrawn EP2301358A3 (fr) 2009-09-02 2010-09-01 Installation de récupération de chaleur d'un four de cuisson

Country Status (2)

Country Link
EP (1) EP2301358A3 (fr)
DE (1) DE102009039689A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107788047A (zh) * 2016-09-06 2018-03-13 今麦郎食品有限公司 一种余热回收装置及油炸机
EP4343207A1 (fr) * 2022-09-26 2024-03-27 MIWE Michael Wenz GmbH Four de cuisson avec régulation de la pression de la chambre de combustion

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2098450B (en) * 1981-05-11 1985-06-12 Haas Franz Sen Wafer baking oven
DE29602748U1 (de) * 1996-02-16 1996-06-05 Poetzscher Carola Einrichtung zur Energierückgewinnung an Backöfen
DE19723407B4 (de) * 1997-06-04 2006-08-24 Esterka, Elke Einrichtung zur Rückgewinnung von Abwärmeenergie an Durchlauföfen
DE20106186U1 (de) * 2001-04-09 2001-07-05 Carola Poetzscher Gmbh & Co Kg Einrichtung zur Energierückgewinnung
DE102005040610A1 (de) * 2005-08-27 2007-03-01 A. Monforts Textilmaschinen Gmbh & Co. Kg Rohrwärmetauscher
DE202007003509U1 (de) * 2007-03-09 2007-05-24 Lebensmittel Stenn Kornfeil Inhaberin Elke Esterka Anlage zur Rückgewinnung von Wärmeenergie und Reinigung von Rauchgasen aus feuerungstechnischen Anlagen
DE102008012395A1 (de) * 2007-09-28 2009-04-23 Miwe Michael Wenz Gmbh Backofen mit Luftaustrittsöffnung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107788047A (zh) * 2016-09-06 2018-03-13 今麦郎食品有限公司 一种余热回收装置及油炸机
EP4343207A1 (fr) * 2022-09-26 2024-03-27 MIWE Michael Wenz GmbH Four de cuisson avec régulation de la pression de la chambre de combustion

Also Published As

Publication number Publication date
DE102009039689A1 (de) 2011-03-03
DE102009039689A8 (de) 2011-06-01
EP2301358A3 (fr) 2013-12-18

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